Yarn drawing apparatus



March 17, 1954 P. J. CORBIERE ETAL 3,124,859

YARN DRAWING APPARATUS 2 Sheets-Sheet 1 Filed Oct. 17, 1960 United States Patent 3,124,859 YARN DRAWING APPARATUS Paul Jacques Corbiere and Pierre Jean Terra, Lyon, France, assignors to Societe Rhodiaceta, Paris, France, a French body corporate Filed Oct. 17, 1960, Ser. No. 63,031 Claims priority, application France Nov. 3, 1959 9 Claims. (Cl. 2859.5)

This invention concerns yarn drawing apparatus and has for its object the provision of new or improved apparatus for drawing synthetic yarns in vapours.

According to this invention, there is provided apparatus for drawing synthetic yarns in vapours after the shaping of such yarns, such apparatus comprising a boiler for producing vapours from a suitable liquid, a vapour treatment chamber arranged to receive vapours through which the yarn is adapted to be passed while being subjected to a drafting operation, a condenser situated above the vapour treatment chamber and arranged so that vapours condensed therein return to the boiler, a device for the introduction of the yarn into the vapour treatment at a linear velocity V and a device for the discharge of the yarn from such chamber at a linear velocity V the velocities V and V being so chosen that V 23 V In order that this invention may more readily be understood, reference will now be made by way of example to the accompanying drawings in which:

FIGURE -1 is a longitudinal section through one em bodiment of apparatus according to this invention; and

FIGURE 2 is a longitudinal section through a second embodiment.

Referring to FIGURE 1, the apparatus there illustrated comprises a boiler 1 surrounded by a jacket.2 for heating by means of a fluid or by electricity, a vapour treatment chamber 3 having a heat-insulating coating 4 and mounted above the boiler 1, a condenser 5 situated above the vapour treatment chamber 3 and surrounded by a cooling jacket 6, a device 7 for the introduction of a yarn at a peripheral velocity V a roller 8 carried by a rod 12 so as to be situated in the vapour treatment chamber, and a device 9 for the discharge of the yarn at a peripheral velocity V 23 V The yarn 10 carried along by the device 7 passes under the roller 8 and is taken up by the device 9 and, as a result of the difference of the peripheral velocities of devices 7 and 9, undergoes in the vapour treatment chamber a draw equal to When the apparatus is in operation, the heating jacket 2 boils liquid 11 situated in the boiler 1. The vapours thus formed enter the vapour treatment chamber 3 and condense on the cold walls of the condenser 5. The liquid thus formed trickles down the walls of the condenser 5 and of the vapour treatment chamber 3 and falls into the liquid 11 in the boiler 1.

Advantageously, the rod 12 on which the roller 8 is mounted may be arranged to be vertically movable in order that the yarn may be initially engaged around the roller 8 outside the vapour treatment chamber, so that such engagement operation is facilitated, the rod being lowered to the position indicated in the drawing after the positioning of the yarn.

The devices 7 and 9 may also be arranged to follow this movement, or alternatively the movable rod may comprise guide means which follow the movement of the rod so as to maintain the yarn in position during such movement.

FIGURE 2 illustrates a second embodiment of apparatus according to the invention, this apparatus comprising a boiler 13 surrounded by a jacket 14 for heating by means of a fluid or by electricity, a vapour treatment chamber 15 which is surrounded by heat insulation and by a heating jacket 16 and communicates with the boiler 13 through a pipe 17, a condenser 18 surrounded by a cooling jacket 19, a circular device 20 for the recovery of condensed liquid and a pipe 21 conducting the condensed liquid to a purifying device 22 before it is returned to the boiler 13 through a pipe 23, a device 24 for the introduction of the yarn, actuated at a peripheral velocity of V a roller 25 situated in the vapour treatment chamber and mounted on a rod 26 and a device 27 for the discharge of the yarn at a peripheral velocity V 3XV The yarn 28 carried along by the device 24 passes under the roller 25 and is taken up by the device 27 and undergoes a draw equal to When the apparatus is in operation, the heating jacket 14 boils liquid 29 contained in the boiler 13. The vapours thus formed pass through the pipe 17 and through the vapour treatment chamber 15 and become condensed on the walls of the condenser 18. The'liquid thus formed trickles down these walls. It is then collected at 20 and passes through the pipe 21 into the purifying device 22, in which the used liquid is separated from any impurities contained therein and emanating from products situated on the yarn subjected to the drafting which have been entrained by the vapours. The purified liquid thereafter returns to the boiler 13 through the pipe 23. .As in the preceding apparatus, it may be advantageous for the rod 26 on which the roller 25 is mounted to be movable in order to facilitate the positioning of the yarn and to permit the adjustment of the length of yarn introduced into the apparatus and consequently of the time for which the yarn remains in the apparatus as a function of its speed of travel.

The apparatus according to the invention is particularly suitable for use in the drawing of filaments consisting of polymers based on acrylonitrile in saturated steam, and the drawing of polyvinyl alcohol filaments. It may be used for the hot drawing of polyamides and polyesters in any vapours.

We claim:

1. Apparatus for drawing synthetic yarns, such appartus comprising a boiler for producing vapors from a suitable liquid, a vapor treatment chamber communicating with said boiler so as to receive therefrom vapors produced therein, a condenser positioned above the vapor treatment chamber so as to receive vapor passing out from said chamber and communicating with the boiler so that vapors condensed in the condenser return to the boiler, a feed device adapted to receive yarn and positioned to feed such yarn into said vapor treatment chamber at a linear velocity V means within the vapor treatment chamber for guiding yarn received from said feed device through the vapor in said chamber and a drawing means positioned to receive yarn from said guide means and withdraw yarn from the vapor treatment chamber at a linear velocity not less than 3V 2. Apparatus for use in the drawing of synthetic yarns, such apparatus comprising a boiler adapted to receive a suitable liquid and to produce vapors of the latter, a vapor treatment chamber positioned above the boiler and in communication with the upper part thereof so that vapors produced therein are led to the vapor treatment chamber, a condenser so positioned directly above the vapor treatment chamber that vapor in the latter passes into the condenser and is there condensed to form liquid which passes downwardly through the vapor treatment Patented Mar. 17, 1964 chamber and into the boiler, means within the vapor treatment chamber for guiding yarn on the passage of the latter through the chamber, a roller feed device adapted to receive yarn and to feed such yarn through the vapor in the chamber to said supporting means at a velocity V and roller drawing means for removing the yarn through the vapor from said guiding means at a velocity not less than 3V] 3. The apparatus specified in claim 2 in which said roller feed device and said roller drawing means are disposed above said condenser whereby said yarn passes through said condenser into said chamber around said guiding means and out through said condenser.

4. Apparatus for use in the drawing of synthetic yarns, such appparatus comprising a vapor treatment chamber, a boiler constructed and arranged to supply Vapors of a suitable liquid to the vapor treatment chamber, a condenser positioned above the vapor treatment chamber so that vapor from the latter passes into the condenser and is condensed therein, means for collecting vapor condensed in the condenser, a purifying device connected to receive condensed vapor from said collecting means, duct means connecting said purifying device to said boiler for passing to the latter condensed vapor received from the condenser, means within the vapor treatment chamber for guiding yarn on the passage of the latter through the vapor in said chamber, roller feed means adapted to receive yarn and to feed such yarn to said guiding means at a velocity V and roller drawing means for removing the yarn from said guiding means at a velocity not less than 3V1.

5. The apparatus specified in claim 4, in which said yarn guiding means comprises a roller over which the yarn is adapted to pass.

6. The apparatus specified in claim 5, and including a member extending downwardly into the vapor treatment chamber and carrying the said roller so that the latter is positioned therein, said member being movable to a position in which the roller is retracted from the vapor treatment chamber.

7. The apparatus specified in claim 4 in which said roller feed means and said roller drawing means are disposed above said condenser whereby said yarn passes through said condenser into said chamber around said guiding means and out through said condenser.

8. In an apparatus for drawing synthetic yarns the improvement consisting in having in combination a boiler for producing vapors of a suitable liquid; a substantially vertical vapor treatment chamber communicating with said boiler and positioned to receive the vapor from said boiler, a condensing jacket positioned above said vapor treatment chamber, extending said vapor treatment chamber in a substantially vertical direction so that the condensed vapors return to said boiler; a feed device adapted to receive yarn and positioned to feed such yarn through the jacket to the vapor treatment chamber at a linear velocity V means within the vapor treatment chamber for guiding yarn received from said feed device through the vapor in said chamber and a drawing means positioned to receive yarn from said guide means and Withdraw yarn from said vapor treatment chamber through the jacket at a velocity not less 3V said feed device, guiding means and drawing means being so positioned that the yarn follows, while being drawn, a looped path substantially axial to said vapor treatment chamber and to said jacket.

9. In an apparatus for drawing synthetic yarns the improvement consisting in having in combination a boiler for producing vapors of a suitable liquid; a substantially vertical vapor treatment chamber communicating with said boiler and positioned to receive the vapor from said boiler; a condensing jacket positioned above said vapor treatment chamber, extending said vapor treatment chamber in a substantially vertical direction, means for collect ing liquid condensed in said jacket, a purifying device connected to receive liquid from said collecting means, duct means connecting said purifying device to said boiler for passing to the latter liquid received from the jacket, a feed device adapted to receive yarn and positioned to feed such yarn through the jacket to the vapor treatment chamber at a linear velocity V means within the vapor chamber for guiding yarn received from said feed device through the vapor in said chamber and a drawing means positioned to receive yarn from said guide means and with draw yarn from said vapor treatment chamber through the jacket at a velocity not less 3V said feed device, guiding means and drawing means being so positioned that the yam follows, while being drawn, a looped path substantially axial to said vapor treatment chamber and to said jacket.

References Cited in the file of this patent UNITED STATES PATENTS 2,142,717 Dreyfus et a1. Jan. 3, 1939 2,279,479 Moncrietf et a1. Apr. 14, 1942 2,450,045 Jackson et al Sept. 28, 1948 2,509,741 Miles May 30, 1950 FOREIGN PATENTS 615,179 Great Britain Jan. 3, 1949 

1. APPARATUS FOR DRAWING SYNTHETIC YAARNS, SUCH APPARTUS COMPRISING A BOILER FOR PRODUCING VAPORS FROM A SUITABLE LIQUID, A VAPOR TREATMENT CHAMBER COMMUNICATING WITH SAID BOILER SO AS TO RECEIVE THEREFROM VAPORS PRODUCED THEREIN, A CONDENSER POSITIONED ABOVE THE VAPOR TREATMENT CHAMBER SO AS TO RECEIVE VAPOR PASSING OUT FROM SAID CHAMBER AND COMMUNICATING WITH THE BOILER SO THAT VAPORS CONDENSED IN THE CONDENSER RETURN TO THE BOILER, A FEED DEVICE ADAPTED TO RECEIVE YARN AND POSITIONED TO FEED SUCH YARN INTO SAID VAPOR TREATMENT CHAMBER AT A LINEAR VELOCITY V1, MEANS WITHIN THE VAPOR TREATMENT CHAMBER FOR GUIDING YARN RECEIVED FROM SAID FEED DEVICE THROUGH THE VAPOR IN SAID CHAMBER AND A DRAWING MEANS POSITIONED TO RECEIVE YARN FROM SAID GUIDE MEANS AND WITHDRAW YARN FROM THE VAPOR TREATMENT CHAMBER AT A LINEAR VELOCITY NOT LESS THAN 3V1.
 4. APPARATUS FOR USE IN THE DRAWING OF SYNTHETIC YARNS, SUCH APPARATUS COMPRISING A VAPOR TREATMENT CHAMBER, A BOILER CONSTRUCTED AND ARRANGED TO SUPPLY VAPORS OF A SUITABLE LIQUID TO THE VAPOR TREATMENT CHAMBER, A CONDENSER POSITIONED ABOVE THE VAPOR TREATMENT CHAMBER SO THAT VAPOR FROM THE LATTER PASSES INTO THE CONDENSER AND 